Pregnancy should be considered first in women of normal childbearing age who are sexually active and have delayed periods for more than 10 days. It may also be associated with adolescence and immature gonadal development. Or there may be a partial association with psychoneurological factors, medications, and disease factors such as infections or non-infectious factors. In addition, poor lifestyle habits such as a taste for cold water can lead to constriction of the pelvic blood vessels and cause ovarian dysfunction, which may also lead to delayed periods.